I want to print a PDF from my CAD tool, and then convert the PDF to Gerber/Drill. How do I do this with FAB 3000?

Make sure the PDF generated is quality or else it will result in bad/useless gerber files. Nitro PDF works very well when printing out to PDF from a CAD tool. Here's the link to a PDF of a board generated with Nitro so you can see the quality of the Pads and Text, compared to the PDF you sent me:

http://www.numericalinnovations.com/pdfs/PCB_sample.pdf

Here's a movie tutorial showing how to convert Gerber/Drill from a PDF (no sound):

http://www.youtube.com/watch?v=5EjqnHtSzzU

Note: I would probably use File | Export | PCB..., because it exports Gerbers and Drill at the same time.

Here's a tutorial about using FAB 3000 to merge multiple PCB's onto a panel: